MONOGRAPII OF THE LABOULBENIACE^E. 



331 



A very well marked and in the case of well developed specimens one of the most striking 

 species of the genus, easily recognized by the crest-like series of branches from the outer 

 appendage, which, however, varies very considerably. Tlic specimens from Mexico and Europe 

 illustrate the extremes of development as far as the appendages are concerned, fig. 29 represent- 

 ing a specimen from the first mentioned locality. The species is rather common in dry or moist 

 situations, the hosts being abundant in rubbish in cultivated land. It is doubtless this form 

 which is mentioned by Rouget as occurring on Pcederus in France and confused by him with 

 L. Eongetii. It is a distinctly isolated form, and cannot be said to be definitely related to any 

 of the known species of the genus except the following, although an undescribed form occurs on 

 Bledius, which approaches it in some respects. 



Laboulbenia Diopsis nov. sp. Plate III, fig. 6. 



Perithecium dull amber brown, a blackish patch below the hyaline lip margins on the inner 

 side, the inner edge rather straight, the apex large, prominent and somewhat abruptly dis- 

 tinguished, the insertion of the trichogyne usually conspicuous. Receptacle often very long- 

 stalked through the great elongation of cell II ; the distal portion small, compact, rather 

 abruptly distinguished from cell II, its cells more or less uniform in size ; the whole tinged with 

 brown, the distal part more deeply. Appendages arising from an inner and an outer cell, the 

 inner usually producing two short two- to three-celled branches bearing the long, slender anthe- 

 ridia ; the outer followed by three cells: the lower producing from their inner side one, rarely 

 two, superposed branches, the upper a crest-like series of branches arranged antero-posteriorly in 

 a single row. All the branches more or less deeply tinged with brown, somewhat constricted at 

 the septa, rarely furcate above the basal cell, often tending to grow stouter distally, the terminal 

 cell of each bluntly rounded or tapering but slightly. Spores, about 7 x 55 \i. Perithecia, 

 110-140 x 30-3§ ix. Receptacle : distal portion about 35 x 50 yu. Cell II, 200-500 x 25 

 Total length to tip of perithecium, 300-800 p. 



On Diopsis thoracica Westw., Coffee Hill, Liberia, Africa (O. F. Cook). 



This curious form, which was first observed on its singular host by Professor Cook, is the 

 first species of the genus which has been found on a dipterous insect,, in the present instance a 

 fly with stalked eyes, and, according to Professor Cook, with riparian habits. It seems in gen- 

 eral to be subject to little variation except in the length of cell II, which may be greatly elon- 

 gated. In the general form of its perithecium and receptacle it recalls to some extent L. subter- 

 ranea ; but it is undoubtedly more closely related to L. cristata than to any other species, as is 

 indicated by the form of its appendages and antheridia. as well as by the outline of its perithe- 

 cium. The types were found on the legs and abdomen as well as on the eye stalks of the host 

 on which, from their length and dark color, they are quite conspicuous. 



Laboulbenia Brachini Thaxter. Plate XX, figs. 1-8. 



Proc. Am. Acad. Arts and Sci. Vol. XXVII, p. 40. 



Amber yellow, becoming more or less suffused with amber brown. Perithecium rather 

 small and stout, somewhat inflated, the apex deep black, large, bluntly rounded. Appendages 



